Basic Plant Biology A Review
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1 Basic Plant Biology A Review
2 What is a plant? Traditional View of Biology: Animals and Plants
3 What is a plant? Traditional View of Biology: Animals and Plants Problem: Microscopic Organisms (Bacteria, Fungi, Algae)
4 What is a plant? Traditional View of Biology: Animals and Plants Problem: Microscopic Organisms (Bacteria, Fungi, Algae) Complication: Endosymbiotic origin of organelles (Lynn Margulis) Membrane-bound structures in eukaryotic cells are derived from formerly free-living organisms that have become intimately symbiotic
5 What is a plant? Traditional View of Biology: Animals and Plants Problem: Microscopic Organisms (Bacteria, Fungi, Algae) Complication: Endosymbiotic origin of organelles (Lynn Margulis) Membrane-bound structures in eukaryotic cells are derived from formerly free-living organisms that have become intimately symbiotic Further Information: DNA molecular phylogenetic information 1. Confirming evidence for endosymbiotic theory
6 What is a plant? Traditional View of Biology: Animals and Plants Problem: Microscopic Organisms (Bacteria, Fungi, Algae) Complication: Endosymbiotic origin of organelles (Lynn Margulis) Membrane-bound structures in eukaryotic cells are derived from formerly free-living organisms that have become intimately symbiotic Further Information: molecular phylogenetic information 1. Confirming evidence for endosymbiotic theory 2. Suggestion that life split early into at least 3 major lineages
7 Carl Woese and the rrna Tree of Life Carl Woese 1980s ssrna Sequences 3 Domains
8 1. Eukaryotic - nucleus 2. Chloroplasts present 3. Cell wall with cellulose 4. Autotrophic make own food What is a Plant?
9 What is a Plant? 1. Eukaryotic 2. Chloroplasts present 3. Cell wall with cellulose 4. Autotrophic 5. Complex Life Cycle (alternation of generations)
10 Angiosperms - Flowering Plants Flowers developed, Seeds enclosed by pistil, fruit
11
12 Monocots
13 Gyymnosperms naked seed plants Have no flowers or fruit, seeds borne naked
14 Ferns and Fern Allies Vascular plants, but no flowers, no seeds Reproduce by spores
15 Mosses and Liverworts - Bryophytes Lack true roots, stems and leaves Require moisture for fertilization Without vascular tissue; rely on diffusion of water Dispersal by spores
16 Algae - Diverse, single-celled to complex seaweeds Photosynthetic eukaryotes, green plants
17 Fungi not plants Non-photosynthetic eukaryotes, saprophytic, Reproduce by spores, chitin cell walls (not cellulose) Includes yeast
18 Basic Chemistry Review
19 Atoms Atoms are the basic unit of chemistry. They consist of 3 smaller things Protons - these are positively charged (+) Electrons - these are negatively charged (-) Neutrons - these have no charge
20 Elements Pure substances, can t be broken down further e.g. Silver, Copper, Magnesium, Iron The universe is composed of approximately 100 types of atoms. Each type of atom is referred to as an element.
21
22 Organic vs. Inorganic Organic molecules contain Carbon, inorganic molecules do not. CH4 is the formula for methane, it is organic. NaCl is the formula for common table salt, it is inorganic.
23 Chemical Bonding Covalent These strong bonds form when two atoms share electrons.
24 Chemical Bonding Ions Sometimes atoms gain or lose electrons. These atoms are then called ions. Positive Ion - Occurs when an atom loses an electron (negative charge) it has more protons than electrons. Negative Ion - Occurs when an atom gains an electron (negative charge) it will have more electrons than protons.
25 The following image shows Na losing an electron and Cl gaining an electron Thus the Na becomes Na+ The Cl becomes Cl-
26 Hydrogen Bond Weakest bond between atoms.. When the electrons are not equally shared; one atom of the molecule becomes partly negative and the other then becomes partly positive. Positive and negative are attracted to each other. This is especially common between water molecules.
27 Polar and Nonpolar Substances Since the water has opposite charges on different parts of the same molecule we call it Polar. A Polar substance has charges that can interact with the charges in water. Therefore Polar molecules are said to be Hydrophilic too (water loving). A Nonpolar substance then lacks any charges and will not be able to interact with water. Nonpolar molecules are said to be Hydrophobic (water hating).
28 Macromolecules Carbohydrates Lipids Proteins Nucleic Acids
29 Carbohydrates
30 Carbohydrates Carbohydrates are composed primarily of carbon, hydrogen and oxygen and used primarily by living things as a source of energy and for structure. The simplest carbohydrates are sugars called monosaccharides. An example of a monosaccharide is the sugar glucose, formula C6H12O6. Monosaccharides can bond together to form larger carbohydrates called polysaccharides. An example of a polysaccharide is starch as is found in potatoes or pasta.
31 Monosaccharides - Glucose formula C6H12O6
32 Disaccharides - two carbohydrates linked together; ie. sucrose, maltose Maltose Beer is brewed from malted barley
33 Starch and Cellulose differ in how the carbohydrates are linked together, two slightly different types of bonds are used. makes them different enough that one you can easily digest while the other is not digested at all by humans.
34 Polysaccharides Cellulose the most common organic compound on Earth Wood, paper Food additive
35 store extra energy and insulate the body. cell membranes, myelin sheaths, and certain hormones. from animal fat and vegetable oils. Lipids
36
37 Lipids
38 Fatty acids Long neutral carbon chains (C-C-C-C-C-C-C-C-C-C-C-C-C) with carboxyl group at one end. They come in many different lengths, get many different fatty acids. They are non-polar, so they clump together in water (oil and water don't mix.)
39 Triglycerides Three fatty acids linked by glycerol.
40 Phospholipids - remove one fatty acid from a Triglyceride and add a Phosphorous instead. organize themselves in water in unique ways. partly non-polar (long tails) and partly polar (the phosphorous end.)
41 Phospholipids form a Bilayer or a Micelle (round ball) in water Phospholipids are used to construct cell membranes
42 Steroids lipids Oleandrin a toxic cardiac glycoside from Nerium oleander
43 Proteins
44 Proteins Proteins are made by building long chains of amino acids. The Amino acid structure looks like this:
45 The R side chain is attached to central Carbon. Each R side chain has a different structure to it Twenty different types of side chains (20 amino acids)
46 Four Levels of protein structure Primary - exact sequence of amino acids before folding. Secondary - simple folding create simple structures. Tertiary - folding results in complex 3D structures
47 Quaternary - multiple 3D subunits organized into a bigger structure Proper protein function depends on correct 3D structure. Any change in the specific primary structure can cause the protein to fold differently. A different shape can lead to a different function (or lack of proper function).
48 Enzymes Proteins specifically shaped to carry out special functions in cells: They accelerate the rate of chemical reactions necessary for life. Enzymes take a Substrate and convert it into a new Product Each specific reaction needs a specific enzyme. Any changes in their shape will effectively stop chemical reactions.
49 Nucleic Acids One nucleotide has 3 parts: Sugar (pentose, a 5 carbon sugar) Base (A, G, C, T, U) Phosphorous
50
51 Double helix Paired strands are linked by bases Adenine ( A ) Cytosine ( C ) Guanine ( G ) Thymine ( T ) DNA Structure A must bond with T G must bond with C
52 Transcription: DNA => RNA Translation: RNA => Protein (enzymes)
53 ATP adenosine triphosphate Needed when cells require energy. Energy from sunlight is stored in ATP molecules and is used just like a rechargeable battery. Once energy is released, ATP is converted to an ADP (adenosine di-phosphate). Energy currency of metabolism
54 Secondary Compounds
55 Secondary Compounds
56
57
58
59 End
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